diff --git a/bin/calibre-3.39.1-x86_64.txz b/bin/calibre-3.39.1-x86_64.txz
new file mode 100644
index 0000000..773b2ea
Binary files /dev/null and b/bin/calibre-3.39.1-x86_64.txz differ
diff --git a/scripts/add_missing_opf.py b/scripts/add_missing_opf.py
new file mode 100644
index 0000000..7571770
--- /dev/null
+++ b/scripts/add_missing_opf.py
@@ -0,0 +1,97 @@
+from argparse import ArgumentParser
+from pathlib import Path
+import re
+import sys
+from hashlib import sha1
+from xml.etree import ElementTree as ET
+
+
+ET.register_namespace('',"http://www.idpf.org/2007/opf")
+ET.register_namespace('dc','http://purl.org/dc/elements/1.1/')
+
+def rewrite_opf(from_path, to_path, calibre_id, title):
+	et = ET.parse(from_path)
+	# print (ET.tostring(et.getroot(), method="xml", encoding="unicode"))
+	for tag in et.findall(".//{http://purl.org/dc/elements/1.1/}identifier[@{http://www.idpf.org/2007/opf}scheme='calibre']"):
+		print ("found calibre_id", tag.text)
+		tag.text = f"{calibre_id}"
+	for tag in et.findall(".//{http://purl.org/dc/elements/1.1/}title"):
+		if tag.text == "Untitled":
+			title = title.split("/", 1)[-1]
+			title = title.strip()
+			tag.text = title
+	et.write(to_path, xml_declaration = True, encoding = 'utf-8', method = 'xml')
+
+ap= ArgumentParser("add_missing_opf", description="add missing OPF files from one Calibre library to another, preserving calibre_id's")
+ap.add_argument("library", help="the library to fix (keep)")
+ap.add_argument("tmp", help="the tmp library to use as source of OPF files")
+args = ap.parse_args()
+
+def hash_file (path):
+	ret = sha1()
+	with open(path, "rb") as fin:
+		while True:
+			data = fin.read()
+			if not data:
+				break
+			ret.update(data)
+	return ret.hexdigest()
+
+def metadata_files (library_path):
+	for author_folder in Path(library_path).glob("*"):
+		if author_folder.is_dir():
+			for title_folder in author_folder.glob("*"):
+				m = re.search(r"^(.*)\((\d+)\)$", title_folder.name)
+				# print (f"{title_folder}, {m.groups()}")
+				if title_folder.is_dir() and m is not None:
+					title = m.group(1)
+					calibre_id = int(m.group(2))
+					opf = title_folder / "metadata.opf"
+					# opf = list(title_folder.glob("metadata.opf"))
+					title_id = f"{author_folder.name}/{title}"
+
+					book_media = list(title_folder.glob("*.pdf")) + list(title_folder.glob("*.epub"))
+					book_media.sort()
+					if len(book_media):
+						title_hash = hash_file(book_media[0])
+					else:
+						title_hash = None
+						print (f"warning: no book media {title_folder}")
+
+					yield title_id, title_hash, calibre_id, opf
+					
+
+print (f"PASS 1: {args.tmp}")
+metadata_by_title = {}
+for title, title_hash, calibre_id, metadata in metadata_files(args.tmp):
+	if metadata:
+		if title_hash in metadata_by_title:
+			print (f"warning: duplicate title: {title_hash}", file=sys.stderr)
+		metadata_by_title[title_hash] = metadata
+print ()
+print (f"PASS 2: {args.library}")
+replaced_count = 0
+missing_count = 0
+existing_count = 0
+
+for title, title_hash, calibre_id, metadata in metadata_files(args.library):
+	if not metadata.exists():
+		if title_hash not in metadata_by_title:
+			print (f"NO METADATA for {title}")
+			missing_count += 1
+			continue
+		else:
+			old_metadata = metadata_by_title[title_hash]
+			# print (f"have metadata for {title}")
+			replaced_count += 1
+			print (old_metadata)
+			rewrite_opf(old_metadata, metadata.parent / "metadata_new.opf", calibre_id, title)
+	else:
+		existing_count += 1
+
+total = existing_count + replaced_count + missing_count
+print (f"Of {total} items, {existing_count} had metadata, {replaced_count} can be replaced, {missing_count} missing.")
+
+
+
+
diff --git a/scripts/add_missing_opf_finalize.py b/scripts/add_missing_opf_finalize.py
new file mode 100644
index 0000000..7e7d1b9
--- /dev/null
+++ b/scripts/add_missing_opf_finalize.py
@@ -0,0 +1,25 @@
+from argparse import ArgumentParser
+from pathlib import Path
+import re
+import sys
+
+ap= ArgumentParser("add_missing_opf_finalize")
+ap.add_argument("library", help="the library to fix (keep)")
+ap.add_argument("tmp", help="the tmp library to use as source of OPF files")
+args = ap.parse_args()
+
+for author_folder in Path(args.library).glob("*"):
+    if author_folder.is_dir():
+        for title_folder in author_folder.glob("*"):
+            m = re.search(r"^(.*)\((\d+)\)$", title_folder.name)
+            # print (f"{title_folder}, {m.groups()}")
+            if title_folder.is_dir() and m is not None:
+                title = m.group(1)
+                calibre_id = int(m.group(2))
+                opf = title_folder / "metadata.opf"
+                opf_new = title_folder / "metadata_new.opf"
+                if (not opf.exists()) and opf_new.exists():
+                    print (f"Renaming {opf_new} -> {opf}")
+                    opf_new.rename(opf)
+
+